TABLE 2k- (Cont'd) 

 Conversion from 1936 International Meteorological Organization Code to the 



WMO Code if 501 



30 

 31 

 32 

 33 

 3^^ 

 35 

 36 

 37 

 38 

 39 



1^0 

 Ui 

 k2 



h3 



kk 



h3 

 k6 

 hi 

 kQ 

 h9 



50 

 51 

 52 

 53 

 3h 

 55 

 56 

 57 

 58 

 59 



DUST STORMS AMD STORMS OF DRIFTING SROW 

 (Visibility less than 1,000 m., 1,100 yards) 



Dust or sand storm. 



Dust or sand storm, has decreased. 



Dust or sand storm, no appreciable change. 



Dust or sand storm, has increased. 



Line of dust storms. 



Storm of drifting sncrw. 



Slight storm of drifting snow 



Heavy storm of drifting snov?- 



Slight storm of drifting snow 



Eeavj^ storm of drifting snow 



generally low. 

 generally high. 



WMO 

 Code 

 ^4-501 

 (modified) 



3 

 3 

 3 

 3 



3 

 3 

 3 

 3 

 3 



FOG 



(Visibility less than 1,000 m., 1,100 yards) 



Fog. 



Moderate fog in last hour K ^^ ^^^ ^^ ^^^ ^^ observation. 

 Thick fog in last hour J 



I has became thinner during last hour. 

 I no appreciable change during last hour 



I 



Fog, sky discernible 

 Fog, sky not discernible 

 Fog, sky discernible 

 Fog, sky not discernible 

 Fog, sky discernible 

 Fog, sky not discernible 

 Fog in patches. 



has begun or become thicker during 

 last hour 



DRIZZLE 

 (Precipitation consisting of numerous minute drops) 



Drizzle 



Intermittent ) 

 Continuous I 

 Intermittent I 

 Continuous ' 

 Intermittent ) 

 Continuous ' 

 Drizzle and fog. 

 Slight or moderate 

 Thick 



slight drizzle. 



moderate drizzle. 



thick drizzle. 



drizzle and rain. 



k 

 k 

 h 

 h 



k 

 h 

 k 

 k 

 k 

 k 



5 

 5 

 5 

 5 

 5 

 5 

 5 



5 

 5 



61 



